.setProperty() 建議編輯

                    browser.element(selector).setProperty(name, value)
                

export default {
  demoTest(browser: NightwatchAPI): void {
    browser.element('#login').setProperty('title', 'Hello');
  },

  async demoTestAsync(browser: NightwatchAPI): Promise<void> {
    await browser.element('#login').setProperty('title', 'Hello');
  }
}